2001 Ranger won't start in cold weather

I just got a new battery yesterday. Sears checked the alternator, voltage regulator, even battery. Said all was okay. Got new battery anyway. 29 degrees this morning, truck will not start. Lights come on, radio, heater,
etc., but nothing from the engine. Help!
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Argghhhh... you're going to HAVE to be a little more specific!
Are you saying it doesnt crank, or crank fast enough?
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more information.what's the mileage.has it ever done this before?how many times total.try taking trans out of park and put back or try neutral to see if it starts.any other recent work on vehicle.do dash engine red warning lights come on?
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